Extending ice water line - best option?

We're relocating our refrigerator and need to re-route the water supply line for the ice machine.

Original supply valve is stubbed up through slab-on-grade foundation with a male flare fitting.
I'm planning on tapping this valve and running ~ 25' up through the attic and down to the new location.
(The below original valve will be in a pantry. I plan on running the line thru the wall and just come out and attach and then protect with a cover.)

What's the best line / connection fitting to use?
PEX? Copper? S/S Braid?
Best source to buy besides the big box stores?

I'm planning on wrapping the line in the attic with insulation to mitigate the heat transfer.
Appreciate any and all recommendations.

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Extending ice water line - best option?

Is the kitchen sink close to the new location? Can you route a waterline thru the cabinet and hook it up at the angle stop? If you have no other water nearby, I would drill it into the wall right above the valve, and run one piece of copper all the way to the new fridge location. Cover that valve, just to make sure nobody can bump it. Best yet, open the wall and route that 1/2" copper up and install a new valve behind the new fridge location